5 weeks in isn't really that long in TSM terms. Just keep doing what you're doing and you will likely see improvements. Oh, and remember, if you're trying not to drink two bottles of wine a night, what you're "doing wrong" is still drinking two bottles of wine a night. If you're an "average" person, Naltrexone has probably already gifted you with some extra "will-power" you didn't have 5 weeks ago. I'd say now is about the time you should start actively trying to NOT drink your normal amount. Naltrexone's not a magic pill, just a tool to give you strength that you wouldn't otherwise have.
Are you able to sabotage your habits (when sober) such that you only have one bottle of wine available to drink? Along those lines, try to think of crafty ways to "trick" drunk-you when you are sober. Once you start breaking the 2-bottle-a-night habit, then you can start trying to knock-out alcohol-free days here and there. Then string them together. Then add them up to nice lengths of time. That's when you're free.
Here's a clip from a movie (Ella Enchanted). When I saw this scene years ago (while drunk, of course) I broke down in tears because it really represented my addiction to me. In the scene, Ella is under a curse wherein she has to obey everything anyone tells her to do. In this scene, she is commanded to kill the prince, her love. This is when she breaks the spell -- "What's inside of you is stronger than any spell." The look on her face when she says, "I'm free" about killed me. Hang in there, once you break this 2-bottle spell, you'll probably realize how weak and silly it all was.
http://www.youtube.com/watch?v=l24yOwR9saU